Shortcut-JFS: A write efficient journaling file system for phase change memory

Eunji Lee, Seunghoon Yoo, Jee Eun Jang, Hyokyung Bahn

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

41 Scopus citations

Abstract

Journaling file systems are widely used in modern computer systems as it provides high reliability with reasonable performance. However, existing journaling file systems are not efficient for emerging PCM (Phase Change Memory) storage. Specifically, a large amount of write operations performed by journaling incur serious performance degradation of PCM storage as it has long write latency. In this paper, we present a new journaling file system for PCM, called Shortcut-JFS, that reduces write amount of journaling by more than a half exploiting the byte-accessibility of PCM. Specifically, Shortcut-JFS performs two novel schemes, 1) differential logging that performs journaling only for modified bytes and 2) in-place checkpointing that removes unnecessary block copy overhead. We implemented Shortcut-JFS on Linux 2.6, and measured the performance of Shortcut-JFS and legacy journaling schemes used in ext 3. The results show that the performance improvement of Shortcut-JFS against ext 3 is 40% on average.

Original languageEnglish
Title of host publication2012 IEEE 28th Symposium on Mass Storage Systems and Technologies, MSST 2012
DOIs
StatePublished - 2012
Event2012 IEEE 28th Symposium on Mass Storage Systems and Technologies, MSST 2012 - Pacific Grove, CA, United States
Duration: 16 Apr 201220 Apr 2012

Publication series

NameIEEE Symposium on Mass Storage Systems and Technologies
ISSN (Print)2160-1968

Conference

Conference2012 IEEE 28th Symposium on Mass Storage Systems and Technologies, MSST 2012
Country/TerritoryUnited States
CityPacific Grove, CA
Period16/04/1220/04/12

Keywords

  • File Systems
  • Journaling
  • Phase Change Memory

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